MEDICAL DEVICES FORMED FROM POLYMER FILAMENTS

• US 20180185181A1
• Filed: 12/22/2017
• Published: 07/05/2018
• Est. Priority Date: 12/29/2016
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Granted Patent: US 10,966,848 B2
• Time in Patent Office: Days
• CPC Class Codes: A61F 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2250/0031 made from both resorbable and non-resorbable prosthetic parts, e.g. adjacent parts
• CPC Class Codes: A61L 27/14 Macromolecular materials
• CPC Class Codes: A61L 29/04 Macromolecular materials
• CPC Class Codes: A61L 31/041 Mixtures of macromolecular compounds
• CPC Class Codes: A61L 31/06 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds A61L31/041 takes precedence
• CPC Class Codes: A61L 31/148 Materials at least partially resorbable by the body
• CPC Class Codes: C08L 67/04 Polyesters derived from hydroxycarboxylic acids, e.g. lactones C08L67/06 takes precedence
• CPC Class Codes: D01D 5/00 Formation of filaments, threads, or the like

Abstract

Medical devices and method for manufacturing medical devices are discloses. An example medical device may include a medical device body formed from one or more multi-melting point polymeric filaments. Each of the filaments may include a polymeric blend comprising a first block polymer and a second polymer. The polymeric blend may have a first melting point and a second melting point less than the first melting point. The medical device body may be heat set at a temperature within 10° C. of the second melting point.

Claims

1. A method for manufacturing a medical device, the method comprising:

forming a multi-melting point filament, wherein the filament includes a blend of a first polymer and a second polymer;

wherein the filament includes a first melting point and a second melting point lower than the first melting point;

forming the filament into an implantable medical device; and

heat setting the filament at a temperature within 10°

C. of the second melting point.

2. The method of claim 1, wherein the first polymer includes a block polymer.

3. The method of claim 1, wherein the first polymer includes a block polymer of poly(glycolic acid) and polycaprolactone.

4. The method of claim 1, wherein the first polymer includes a block polymer of poly-L-lactic acid and polycaprolactone.

5. The method of claim 4, wherein the block polymer includes about 60% or more of poly-L-lactic acid.

6. The method of claim 4, wherein the block polymer includes about 70% or more of poly-L-lactic acid.

7. The method of claim 1, wherein the second polymer includes polycaprolactone.

8. The method of claim 1, wherein the first polymer includes a biodegradable polymer.

9. The method of claim 1, wherein the implantable medical device includes a stent.

10. The method of claim 1, wherein forming the filament into an implantable medical device includes weaving, knitting, braiding, or combinations thereof.

11. The method of claim 1, wherein forming a multi-melting point filament includes extruding the blend of the first polymer and the second polymer.

12. The method of claim 11, wherein extruding includes extruding at a temperature at or above the first melting point.

13. A medical device, comprising:

a medical device body formed from one or more multi-melting point polymeric filaments;

wherein each of the filaments includes a polymeric blend comprising a first block polymer and a second polymer;

wherein the polymeric blend has a first melting point and a second melting point less than the first melting point;

wherein the medical device body is heat set at a temperature within 10°

C. of the second melting point.

14. The medical device of claim 13, wherein the first block polymer includes a block polymer of poly-L-lactic acid and polycaprolactone.

15. The medical device of claim 14, wherein the second polymer includes polycaprolactone.

16. The medical device of claim 15, wherein the first block polymer includes about 70% or more of poly-L-lactic acid.

17. The medical device of claim 13, wherein the first block polymer is biodegradable.

18. The medical device of claim 13, wherein the one or more multi-melting point polymeric filaments are woven, knit, braided, or combinations thereof.

19. The medical device of claim 13, wherein the medical device body includes a plurality of multi-melting point polymeric filaments.

20. A stent, comprising:

a cylindrical body formed from a plurality of woven polymeric filaments;

wherein each of the plurality of woven polymeric filaments include a polymeric blend comprising a first block polymer and a second polymer;

wherein the polymeric blend has a first melting point and a second melting point lower than the first melting point;

wherein the first block polymer comprises poly-L-lactic acid and polycaprolactone;

wherein the second polymer comprises polycaprolactone; and

wherein the cylindrical body is heat set at a temperature within 10°

C. of the second melting point.